Prototyping Next-Generation Communication Systems with Software-Defined Radio

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1 Prototyping Next-Generation Communication Systems with Software-Defined Radio Dr. Brian Wee RF & Communications Systems Engineer 1

2 Agenda 5G System Challenges Why Do We Need SDR? Software Defined Radio Architecture and Platforms 5G Vectors of Research PHY Enhancements Massive MIMO mmwave Wireless Networks 2

3 Connecting the Hyper Connected Everything Starts with Prototyping Data Rate Capacity Power Consumption Coexistence Security Monitoring 3

4 ITU-R Vision for 5G >10 Gb/s Peak Rate 100 X More Devices < 1 ms Latency 4

5 Prototyping Is Critical for Algorithm Research Experience shows that the real world often breaks some of the assumptions made in theoretical research, so testbeds are an important tool for evaluation under very realistic operating conditions development of a testbed that is able to test radical ideas in a complete, working system is crucial 1 NSF Workshop on Future Wireless Communication Research 5

6 Software Defined Radio Architecture Multiprocessor Subsystem Real-time signal processor Physical Layer (PHY) Ex. FPGA, DSP CPU GPP Host processor Medium Access Control (MAC) Rx/Tx control Ex. Host GPP, multicore CPU FPGA DSP PLL D/A D/A D/A D/A VCO RF Front End General Purpose RF Dual LOs Contiguous Frequency Range Host Connection Determines Streaming Bandwidth Ex. Gigabit Ethernet, PCI Express. Baseband Converters PLL VCO 6

7 Today s Development Challenge Tools Targets Math (.m files) Simulation (Hybrid) User Interface (HTML) FPGA (VHDL, Verilog) Host Control (C, C++,.NET) DSP (Fixed Point C, Assembly) H/W Driver (C, Assembly) System Debug FPGAs Multicore Processors SDR development requires multiple, disparate software tools Software tools don t address system design Long Learning Curves Limited Reuse Need for Specialists Increased Costs Increased Time to Result 7

8 LabVIEW Communications System Design The Next Generation Platform for Software Defined Radio Hardware Software Learning In Product Learning Hardware Aware Design Environment Design Exploration Algorithmic Design Languages 8

9 Candidate 5G Technologies In Need of Prototyping New Modulation New MIMO Tech New Spectrum Higher Density PHY Waveforms Massive MIMO mmwave Densification Explore alternatives to OFDM such as GFDM, FBMC, UFMC that can increase PHY flexibility. Dramatically increase spectral efficiency in existing cell bands by increasing antennas at the basestation by orders of magnitude. Explore extremely wide bandwidths at higher frequencies once thought impractical for commercial wireless. Increase access point density across a geography for reduces power, improves spectrum reuse for increased data rates. 28 GHz, 38 GHz, 60 GHz, and 72 GHz 9

10 Candidate 5G Technologies In Need of Prototyping New Modulation New MIMO Tech New Spectrum Higher Density PHY Waveforms Massive MIMO mmwave Densification Explore alternatives to OFDM such as NOMA, GFDM, FBMC, UFMC that can increase PHY flexibility. Dramatically increase spectral efficiency in existing cell bands by increasing antennas at the basestation by orders of magnitude. Explore extremely wide bandwidths at higher frequencies once thought impractical for commercial wireless. Increase access point density across a geography for reduces power, improves spectrum reuse for increased data rates. 28 GHz, 38 GHz, 60 GHz, and 72 GHz 10

11 Challenges with existing physical layer implementation OFDM is very sensitive against time and frequency asynchronisms Interference between: users, carriers, symbols Carrier frequency offsets: affect performance in the high SNR regime Timing asynchronisms Long cyclic prefix could be used Loss in spectral efficiency long CP vs ISI/ICI Interference reversal at receiver, highly complex signal processing 11

12 Physical Layer Enhancements FBMC Filter bank multi-carrier Polyphase filter banks for pulse shaping in frequency domain Filtering per sub-carrier Offset-QAM modulation No cyclic prefix Source: Josef A. Nossek et al: Filter Bank Based Multicarrier Systems UFMC Universal Filtered Multi Carrier Sub-band filtering (e.g. PRB-wise) No cyclic prefix, but settling time of filter used as guard period QAM modulation GFDM Generalised frequency division multiplexing Circular pulse shaping Reduced CP overhead (vs. OFDM) Spectral shaping Reducedcomplexity equalization 12

13 GFDM LTE Coexistence Prototyping 13

14 Candidate 5G Technologies In Need of Prototyping New Modulation New MIMO Tech New Spectrum Higher Density PHY Waveforms Massive MIMO mmwave Densification Explore alternatives to OFDM such as NOMA, GFDM, FBMC, UFMC that can increase PHY flexibility. Dramatically increase spectral efficiency in existing cell bands by increasing antennas at the basestation by orders of magnitude. Explore extremely wide bandwidths at higher frequencies once thought impractical for commercial wireless. Increase access point density across a geography for reduces power, improves spectrum reuse for increased data rates. 28 GHz, 38 GHz, 60 GHz, and 72 GHz 14

15 Massive MIMO in Cellular Networks Give basestation a large array of antennas (> 10X higher than current systems) Time-division duplexing (TDD) Excess antennas guarantee good channel with high probability Large number of users can be served simultaneously T. L. Marzetta, Noncooperative cellular wireless with unlimited numbers of base station antennas, IEEE Trans. Wireless Comm., vol. 9, no. 11,

16 NI and Massive MIMO Academic INDUSTRY Industry leaders who wish to not be named. 16

17 5G Massive MIMO research activities NI and Lund University Massive MIMO,100x10 antenna system NI and Bristol University Massive MIMO, 128x12 antenna system Bristol and Lund set a new world record in 5G wireless spectrum efficiency an unprecedented bandwidth efficiency of 79.4bit/s/Hz. This equates to a sum rate throughput of 1.59 Gbit/s in a 20 MHz channel 17

18 NI Massive MIMO Application Framework PXIe-1085 Master PXIe-8384_S4 PXIe-8384_S3 PXIe-7976_8 PXIe-7976_7 PXeI-7976_6 PXIe-7976_5 PXIe-6674T PXIe-7976_4 PXIe-7976_3 PXIe-7976_2 PXIe-7976_1 PXIe-8384_S2 PXIe-8384_S1 PXIe-8135 x8 x8 x8 x8 PXIe-1085 Sub_1 PXIe-1085 Sub_2 PXIe-1085 Sub_3 PXIe-1085 Sub_4 PXIe-8381 PXIe-8262_1... PXIe-8262_16 PXIe-8381 PXIe-8262_17... PXIe-8262_32 PXIe-8381 PXIe-8262_33... PXIe-8262_48 PXIe-8381 PXIe-8262_49... PXIe-8262_64 x4 x4 x4 x4 x4 x4 x4 x4 USRP RIO 2x2 (1) USRP RIO 2x2 (16) USRP RIO 2x2 (17) USRP RIO 2x2 (32) USRP RIO 2x2 (33) USRP RIO 2x2 (48) USRP RIO 2x2 (49) USRP RIO 2x2 (64) Antennas 1-32 Antennas Antennas Antennas

19 Candidate 5G Technologies In Need of Prototyping New Modulation New MIMO Tech New Spectrum Higher Density PHY Waveforms Massive MIMO mmwave Densification Explore alternatives to OFDM such as NOMA, GFDM, FBMC, UFMC that can increase PHY flexibility. Dramatically increase spectral efficiency in existing cell bands by increasing antennas at the basestation by orders of magnitude. Explore extremely wide bandwidths at higher frequencies once thought impractical for commercial wireless. Increase access point density across a geography for reduces power, improves spectrum reuse for increased data rates. 28 GHz, 38 GHz, 60 GHz, and 72 GHz 19

20 mmwave 5G Technology Vision Existing cellular bands are crowded and expensive The next frontier is mmwave frequencies to provide High throughput (> 10 Gb/s) Lower latency (< 1ms) Enables ultra-definition media and tactile applications image from electronicdesign.com 20

21 mmwave Application Prototypes with SDR Channel sounding at 28, 38 and 72 GHz 21

22 NI and Nokia Demonstrate 10 Gbps Wireless Link Brooklyn 5G Summit Nokia 5G mmwave Beam Tracking Demonstrator (1 GHz BW) Mobile device Access point 22

23 Multi Gbps Cellular Access and Backhaul Prototype Base station mmwave backhaul link Access point mmwave access link User device 23

24 It took about 1 calendar year, less than half the time it would have taken with other tools. -Amitava Ghosh, Nokia Cellular Access Point System LabVIEW mmwave User Device (Handset) System LabVIEW Host PC PXI FlexRIO Baseband RF and Antenna RF and Antenna PXI FlexRIO Baseband Host PC 24

25 Candidate 5G Technologies In Need of Prototyping New Modulation New MIMO Tech New Spectrum Higher Density PHY Waveforms Massive MIMO mmwave Densification Explore alternatives to OFDM such as NOMA, GFDM, FBMC, UFMC that can increase PHY flexibility. Dramatically increase spectral efficiency in existing cell bands by increasing antennas at the basestation by orders of magnitude. Explore extremely wide bandwidths at higher frequencies once thought impractical for commercial wireless. Increase access point density across a geography for reduces power, improves spectrum reuse for increased data rates. 28 GHz, 38 GHz, 60 GHz, and 72 GHz 25

26 5G Wireless Networks: Design Directions Hyperdense networks Software defined networking (SDN) Cloud radio access network (cran) Cellular/ coexistence and coordination Next-generation stack 26

27 Architecture for Protocol Stack Explorations LTE MTC IoT Open Source Upper Layer Stack (e.g. ns-3) Ref Design LTE Ref Design PHY/MAC Stack in LabVIEW NI Hardware 27

28 Summary Next-generation communication system research and development requires a flexible and easily reconfigurable platform to enable rapid development of algorithms and testbeds Software defined radio is providing an ideal platform to rapidly prototype these systems in areas including: Massive MIMO Novel Waveforms mmwave Wireless Testbed/NetworkDevelopment Learn more at: /sdr 28

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